I'm looking at putting a set of 315/70/17 on my stock rims. My questions is when I air them down to 20 psi for beach driving will they pop off the bead or will they be ok. They are only 12" wide on a 8.5 rim, so what would that make them on the 7.5 rim? Just need to know people's thoughts and experiences with this size before I spend the money.

Airing them down should be fine. You are squeezing a tire on a rim thats too narrow so the tire is naturally going to put more pressure on the bead holding it in place. I don't know how wide the tread will end up but they will be taller then when on a 9 or 10 in wide wheel. I had 33/12.5R15's on my stock '86 Chevy wheels for years with no problems. Even with low pressure rock crawling in Moab.

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